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Sandy Purdon, the show producer for the Big Bay Boom, talks about why the fireworks went off all at once. (Published Friday, July 3, 2015)

Updated at 8:48 AM PDT on Friday, Jul 6, 2012

It appears a computer glitch caused the fireworks mishap that disappointed thousands of people camped out to watch the Big Bay Boom in San Diego Bay Wednesday night.

The New Jersey-based company contracted by the Port of San Diego to put together the annual fireworks show said it has offered to do a "makeup show" at no cost to the Big Bay Boom Committee. Watch: Owner Offers to "Make it Right"

At about 8:55 p.m. Wednesday -- 5 minutes before the show was supposed to start -- a sudden burst of fireworks shot into the air in the bay. Throughout downtown San Diego, a large rumble could be felt just before 9 p.m. on Wednesday night.

Tens of thousands of fireworks were set off at the same time. The explosions lasted a few seconds.

Raw Video of Fireworks Mishap

At about 9:20 p.m., people waiting for the display were told to return home. The fireworks show was canceled, a radio announcement said.

Big Bay Bust

Port District authorities said a "technical difficulty" resulted in all the fireworks going off within 15 seconds just minutes before the show was scheduled to begin.

"We sincerely apologize for the technical glitch that affected the #BigBayBoom. Event producers are currently investigating the cause," read a Tweet from the Port of San Diego.

The Port hires the company Garden State Fireworks to operate the fireworks show. Co-owner August Santore spoke with NBC 7 San Diego and said this was not a malfunction of the pyrotechnics nor was not human error. Watch: Fireworks Company Owner Explains Misfire

The crew was up all night testing and retesting to find out what happened he said and they are "pretty confident" there was some sort of glitch in a computer program that was downloaded into all five systems coordinating the fireworks at all five stations.